Antimicrobial Peptide
Definition
A peptide with activity against microorganisms under specified conditions. Some antimicrobial peptides are components of innate immune defense.
By PurePeptideHub Editorial Team · Updated . Educational source review; independent clinical review pending.
Activity depends on the experiment
Antimicrobial is a functional description, not a guarantee of activity against every bacterium, fungus or virus. Laboratory work on human LL-37 found that the organisms and salt conditions influenced measured activity. A result from a culture dish is not equivalent to clearing an infection in a person.
References: [1]
Example: interpreting an assay
Imagine two studies testing the same peptide against the same bacterial species. One uses a simple low-salt medium; the other includes conditions closer to tissue fluid. Different results need not contradict each other. Compare the strain, medium, concentration, exposure time and definition of inhibition before ranking the peptide.
What the label does not establish
A minimum inhibitory concentration describes growth inhibition in an assay. It does not supply a safe human dose, demonstrate delivery to an infected tissue, or establish that the peptide can replace a prescribed antimicrobial treatment. Clinical efficacy and toxicity need their own evidence.